#include <iostream>
using namespace std;

extern "C" {
//////////////////////
void aoo()
{
	cout << "in aoo()" << endl;
}

int boo(int x)
{
	cout << "in boo(" << x << ")" << endl;
	return x + 3;
}

string coo(int x, string& s)
{
	cout << "in coo(" << x << ", '" << s << "')" << endl;
	return s;
}

/////////////////
}	// extern "C"

